Verified Solution • 2025–26 Session
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QNEET-2018-Ph-875: NEET 2018 Physics - Class 12 NEET-2018-Ph-875 Solution: A metallic rod of mass per unit length \(0.5\ {kg m}^{-1}\) is…
A metallic rod of mass per unit length is lying horizontally on a smooth inclined plane which makes an angle of with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is 7.14 A 5.98 A 14.76 A 11.32 A
Multiple Choice Options
- A 7.14 A
- B 5.98 A
- C 14.76 A
- D 11.32 A
Step-by-Step Verified Solution
Given Mass per unit length of a metallic rod is
m l = 0.5 kg m -1
From figure, for equilibrium
mg sin 30 o = I l B cos 30 o
_ I = m g l B tan _ 30 _
= 0.5 _ 9.8 0.25 _ 3 = 11.32 A